Mulligans
General Mulligans
Shatter Shambler provides a good one-drop that cheats out your Korrak or your Halkias. Remember to have a secret active before playing Halkias this way though, because Shattershambler will cause it to immediate his a** into said secret. Sketchy Info is a 50/50 if you don't have a secret in play (same reason as Shattershambler-Halkias) but still draws your impactful minions. Sketchy Stranger just rocks as an early drop. Double Cross is situationally your best early secret to accelerate your gameplay.
A Secret Rogue that uses deathrattle support (with Halkias, Korrak the Bloodrager and Forsaken Lieutenant ) to round out the fairly lackluster secret-based-minions.